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e8fa3b4950
The mode r10g10b10a2_snorm processed as vertex on palm at the hardware level doesn't follow the current standard. Indeed, the .w component (2-bits) is not calculated as expected. The table below describes the situation. This change fixes this issue by adding three gpu instructions at the vertex fetch shader stage. An equivalent C representation and a gpu asm dump of the generated sequence are available below. .w(2-bits) expected palm 0 0.0 0.000000 1 1.0 0.333333 2 -1.0 0.666667 3 -1.0 1.000000 w_out = (4.*w_in > 1. ? 1. : 4.*w_in) - (w_in > 0.5 ? 2. : 0.); 0002 00000008 A0080000 ALU 3 @16 0016 00000C02 A0000CC0 1 y: MOV*4_sat __.y, R2.w 0018 801F8C02 600004A0 w: SETGT*2 __.w, R2.w, 0.5 0020 839FC4FE 60400010 2 w: ADD R2.w, PV.y, -PV.w Note: The rv770 and cypress don't need this correction. This is definitely a hardware change between these gpus. This change was tested on palm, barts and cayman. Here are the tests fixed: spec/arb_vertex_type_2_10_10_10_rev/arb_vertex_type_2_10_10_10_rev-array_types: fail pass deqp-gles3/functional/draw/random/124: fail pass deqp-gles3/functional/vertex_arrays/single_attribute/normalize/int2_10_10_10/components4_quads1: fail pass deqp-gles3/functional/vertex_arrays/single_attribute/normalize/int2_10_10_10/components4_quads256: fail pass khr-gl43/vertex_attrib_binding/basic-input-case5: fail pass khr-gl44/vertex_attrib_binding/basic-input-case5: fail pass khr-gl45/vertex_attrib_binding/basic-input-case5: fail pass Cc: mesa-stable Signed-off-by: Patrick Lerda <patrick9876@free.fr> Reviewed-by: Gert Wollny <gert.wollny@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32427> |
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.